Rack bar



FIG. 1 is a perspective view of a RACK BAR showing the top, front, and right sides;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof; and

FIG. 4 is a left side view thereof- the right side view thereof is identical.

The broken lines depict portions of the RACK BAR that form no part of the claimed design. The dot-dash broken lines depict a symbolic break in the article. The portion between the break lines forms no part of the claimed design. 

CLAIM The ornamental design for a RACK BAR as shown and described. 